code refactoring for new resource and dependency structure WIP
Merge branch 'content_schema' of https://github.com/metacademy/metacademy-application into content_schema
refactored fronend models (WIP)
Merge branch 'content_schema' of https://github.com/metacademy/metacademy-application into content_schema

Conflicts:
	app_server/apps/graph/api.py
restructured resources front/backend
restructured dependency model and associated front/backend
check resource location ids
separated deps and concepts WIP
used proper FK dep relationship and made associated changes to api
set up new goal/dep relationships
Merge branch 'content_schema' of https://github.com/metacademy/metacademy-application into content_schema
fixed some graph tests (currently 44 fails anf 4 errors)